CN217062441U

CN217062441U - Lithium ion battery

Info

Publication number: CN217062441U
Application number: CN202220768652.XU
Authority: CN
Inventors: 南开开; 马剑昌; 张有洪
Original assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Current assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Priority date: 2022-04-01
Filing date: 2022-04-01
Publication date: 2022-07-26
Anticipated expiration: 2032-04-01

Abstract

The application relates to a lithium ion battery, lithium ion battery is the cake shape, and lithium ion battery includes body, anodal utmost point post and negative pole utmost point post, and the body is formed by the pole piece stack, and anodal utmost point post sets up in the side of body along the circumference of body, and negative pole utmost point post sets up in the side of body along the circumference of body, and anodal utmost point post sets up with the relative body symmetry of negative pole utmost point post. The body of the lithium ion battery is formed by overlapping pole pieces, the pole pieces are separated by a diaphragm, the pole pieces are divided into a positive pole piece and a negative pole piece, and the positive pole piece and the negative pole piece are alternately arranged. Along the circumference of body, lithium ion battery's anodal utmost point post and negative pole post all set up in the side of body, and anodal utmost point post and negative pole post are all longer along the length that body circumference set up, consequently the lithium ion battery that this application provided can be in series connection or parallelly connected in the free going on of the radial direction of battery, and the flexibility of the battery of being convenient for is in groups, compares in setting up utmost point post in the battery of battery one end, need not too much to consider arranging of battery and the position of utmost point post.

Description

Lithium ion battery

Technical Field

The application relates to the technical field of batteries, in particular to a lithium ion battery.

Background

Lithium ion batteries are currently commercialized batteries with the highest specific power and energy density, and have been widely used in modern tools such as notebook computers, mobile phones, communication base stations, automobile power supplies and the like. A lithium ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions moving between a positive electrode and a negative electrode. During charging and discharging of lithium ion batteries, Li ⁺ Insertion and extraction back and forth between the two electrodes: on charging, Li ⁺ The lithium ion battery is released from the positive electrode, and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

At present, lithium ion batteries are mainly classified into a winding type and a laminated type. The coiled battery is made up by making positive plate and negative plate into strip-type, welding metal drainage plate at the end of positive plate and negative plate, separating positive plate and negative plate by diaphragm and coiling. The laminated battery is mainly characterized in that positive and negative pole pieces are punched into a plurality of small pieces according to the size of the manufactured battery, and then the small pieces are repeatedly laminated. The positive pole column or the negative pole column of the laminated battery is generally positioned at one end of the battery, and the size of the pole column is small, so that free series-parallel connection among a plurality of batteries is inconvenient.

SUMMERY OF THE UTILITY MODEL

The application provides a lithium ion battery, which enables the lithium ion battery to be freely connected in series and parallel by changing the shape and the position of a pole.

The embodiment of the application provides a lithium ion battery, lithium ion battery is the cake shape, lithium ion battery includes: the body, anodal utmost point post and negative terminal, the body is formed by the pole piece stack, anodal utmost point post is followed the circumference of body set up in the side of body, negative terminal follows the circumference of body set up in the side of body, anodal utmost point post with negative terminal is relative the body symmetry sets up.

In one possible design, the positive electrode post and/or the negative electrode post are located in the middle of the side face of the body.

In one possible design, the positive electrode post and/or the negative electrode post are in the shape of a wire.

In one possible design, the length of the positive electrode pole and the length of the negative electrode pole both satisfy 110mm or more and 920mm or less.

In one possible design, the width of the positive electrode pillar satisfies 0.79mm or more and 3.52mm or less.

In one possible design, the width of the negative electrode pillar satisfies 0.79mm or more and 3.52mm or less.

In one possible design, the diameter D of the body satisfies: d is more than or equal to 100mm and less than or equal to 600 mm.

In one possible design, the height H of the body satisfies: h is more than or equal to 5mm and less than or equal to 60 mm.

In one possible design, the number of pole pieces is equal to or greater than 10 and equal to or less than 200.

In one possible design, the body is encapsulated by a steel housing, an aluminum housing, or an aluminum plastic film.

In this application, lithium ion battery is the cake form, and lithium ion battery's body is formed by the pole piece stack, separates through the diaphragm between the pole piece, and the pole piece divide into positive pole piece and negative pole piece, and positive pole piece and negative pole piece stack setting in turn. Along the circumference of body, lithium ion battery's anodal utmost point post and negative pole post all set up in the side of body, and anodal utmost point post and negative pole post are all longer along the length that body circumference set up, consequently the lithium ion battery that this application provided can be free establish ties or connect in parallel in the radial direction of battery, and the flexibility of the battery of being convenient for is in groups, compares in setting up utmost point post in the battery of battery one end, need not too much to consider the position of arranging and utmost point post of battery.

In addition, because the battery that this application provided is the cake form, the specific surface area of battery is great, is convenient for the heat dissipation of battery, is favorable to carrying out the thermal management. Wherein the specific surface area refers to the total area of the material per unit area. Meanwhile, the height of the round cake-shaped battery is lower than that of most batteries on the market at present, so that the battery can be suitable for environments with narrow spaces, and the space applicability is high.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is a schematic structural diagram of a battery provided herein in one specific embodiment.

Reference numerals:

1-body;

2-positive pole column;

and 3-cathode pole.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The application provides a lithium ion battery, this lithium ion battery makes the series-parallel connection that it can be free through the shape and the position that change utmost point post. As shown in fig. 1, the lithium ion battery is in a shape of a disk, and includes: body 1, anodal utmost point post 2 and negative terminal 3, body 1 is formed by the pole piece stack, and anodal utmost point post 2 sets up in the side of body 1 along the circumference of body 1, and negative terminal 3 sets up in the side of body 1 along the circumference of body 1, and anodal utmost point post 2 sets up with negative terminal 3 relative body 1 symmetry.

In this embodiment, as shown in fig. 1, the lithium ion battery provided in the present application is in a circular cake shape, the body 1 of the lithium ion battery is formed by overlapping pole pieces, the pole pieces are separated by a diaphragm, the pole pieces are divided into a positive pole piece and a negative pole piece, and the positive pole piece and the negative pole piece are alternately overlapped. Along body 1's circumference, lithium ion battery's anodal utmost point post 2 and negative pole utmost point post 3 all set up in body 1's side, and anodal utmost point post 2 and negative pole utmost point post 3 are all longer along the length that body 1 circumference set up, consequently the lithium ion battery that this application provided can be in series connection or parallelly connected freely in the radial direction of battery, and the flexibility of the battery of being convenient for is in groups, compares in setting up utmost point post in the battery of battery one end, need not to consider too much arranging of battery and the position of utmost point post.

In a specific embodiment, as shown in fig. 1, the positive electrode post 2 and/or the negative electrode post 3 is located at the middle of the side of the body 1.

In this embodiment, set up anodal utmost point post 2 and negative pole utmost point post 3 in the middle part of body 1 side can the person of facilitating the use carry out the series-parallel connection to a plurality of batteries, and the surface of body 1 this position is comparatively smooth, does not have convex sharp structure, is difficult for making to connect inefficacy, and consequently the electricity is connected comparatively reliably.

In a specific embodiment, as shown in fig. 1, the positive electrode post 2 and/or the negative electrode post 3 is in the shape of a wire.

In the present embodiment, since the positive electrode post 2 and the negative electrode post 3 are linear, the positive electrode post 2 and the negative electrode post 3 are long in the circumferential direction of the body 1, and thus, series and parallel connection between a plurality of batteries is facilitated. Specifically, the positive electrode post 2 or the negative electrode post may be formed on the surface of the body 1 by welding.

In a particular embodiment, the body 1 is encapsulated by a steel casing, an aluminum casing or an aluminum plastic film.

In this embodiment, encapsulating body 1 can form the protection to the inner structure of battery, makes the battery can shock-resistant and extrusion puncture, has fire prevention fire-retardant effect simultaneously, has improved the leakproofness and the security of battery. Specifically, the packaging material of the body 1 mainly comprises a steel shell, an aluminum shell and an aluminum-plastic film, wherein the steel shell and the aluminum shell are made of harder materials, and the battery packaged by the steel shell and the aluminum shell has better shock resistance; the material of plastic-aluminum membrane is comparatively soft, and the battery weight of adopting plastic-aluminum membrane encapsulation is lighter.

The lithium ion battery provided by the application needs to determine the following parameters according to steps before production:

1) selecting the number of pole pieces required by the lithium ion battery;

2) selecting the size of the lithium ion battery (including the diameter D and the height H of the lithium ion battery);

3) selecting a packaging mode of the lithium ion battery;

4) the dimensions of the pole of the lithium ion battery (including the length and width of the pole) are selected.

In a specific embodiment, the number of pole pieces is 10 or more and 200 or less. For example, the number of pole pieces may be 10, 50, 100, 150, 200, etc.

In the present embodiment, the number of pole pieces directly affects the height of the battery, so the number of pole pieces of the battery should not be too large or too small, and if the number of pole pieces of the battery is too large (for example, more than 200), the height of the body 1 is too high, and the battery cannot be applied in a narrow environment; if the number of pole pieces of the battery is too small (for example, less than 10 pole pieces), the capacity of the battery is too small, the electric energy which can be stored by the battery is too small, and the battery cannot meet the use requirements of people. Therefore, when the number of the pole pieces of the battery is between 10 and 200, the battery can store more electric energy while ensuring that the height of the battery is lower.

In a particular embodiment, as shown in fig. 1, the diameter D of the body 1 satisfies: d is more than or equal to 100mm and less than or equal to 600 mm. For example, the diameter D of the body 1 may be specifically 100mm, 200mm, 400mm, 600mm, or the like.

In the present embodiment, as shown in fig. 1, the diameter D of the main body 1 of the battery should not be too large or too small, and if the diameter D of the main body 1 is too small (for example, less than 100mm), the capacity of the battery is too small, the electric energy that can be stored by the battery is too small, and the battery cannot meet the use requirement of people; if the diameter D of the body 1 is too large (e.g., greater than 600mm), the volume of the battery is too large, and the battery can be applied only in a spacious environment and cannot be applied in a narrow environment. Thus, the diameter D of the body 1 satisfies: when D is more than or equal to 100mm and less than or equal to 600mm, the requirement of the battery on the service environment can be reduced while more electric energy is stored in the battery.

In a particular embodiment, as shown in fig. 1, the height H of the body 1 satisfies: h is more than or equal to 5mm and less than or equal to 60 mm. For example, the height H of the body 1 may be specifically: 5mm, 15mm, 30mm, 45mm, 60mm, etc.

In the present embodiment, as shown in fig. 1, the height H of the main body 1 should not be too high or too small, and if the height H of the main body 1 is too high (for example, higher than 60mm), the battery cannot be applied to a narrow environment; if the height H of the body 1 is too small (for example, less than 5mm), the capacity of the battery is too small, and the electric energy that the battery can store is too small, so that the battery cannot meet the use requirements of people. Thus, the height H of the body 1 satisfies: when the H is more than or equal to 5mm and less than or equal to 60mm, the requirement of the battery on the use environment can be reduced while the battery stores more electric energy.

In a specific embodiment, as shown in fig. 1, the length of the positive electrode post 2 and the length of the negative electrode post 3 both satisfy 110mm or more and 920mm or less. For example, the length of the positive electrode post 2 and the length of the negative electrode post 3 may be specifically: 110mm, 300mm, 500mm, 700mm, 920mm, etc.

In this embodiment, the length of the positive electrode post 2 and the length of the negative electrode post 3 should not be too long or too short, and if the length of the positive electrode post 2 and the length of the negative electrode post 3 are too long (e.g., longer than 920mm), the distance between the end of the positive electrode post 2 and the end of the negative electrode post 3 is too close, and the positive electrode post 2 is easily electrically connected to the negative electrode post 3, thereby damaging the battery; if the length of the positive electrode post 2 and the length of the negative electrode post 3 are too short (for example, shorter than 110mm), the series connection or the parallel connection of the batteries in the radial direction of the body is affected, which causes inconvenience to the user. Therefore, when the length of the positive electrode post 2 and the length of the negative electrode post 3 both satisfy 110mm or more and 920mm or less, the series-parallel connection can be performed more freely in the radial direction of the body while the battery is not easily damaged.

In a specific embodiment, the width of the cathode post 2 and the width of the anode post 3 satisfy 0.79mm or more and 3.52mm or less. For example, the width of the cathode terminal 2 and the width of the anode terminal 3 may be specifically: 0.79mm, 1.50mm, 2.50mm, 3.52mm, etc.

In the present embodiment, the width of the positive electrode post 2 and the width of the negative electrode post 3 should not be too large or too small, and if the width of the positive electrode post 2 and the width of the negative electrode post 3 are too large (for example, greater than 3.52mm), the positive electrode post 2 and the negative electrode post 3 are too thick, which increases the weight of the battery; if the width of the positive electrode terminal 2 and the width of the negative electrode terminal 3 are too small (e.g., less than 0.79mm), the resistance of the terminals becomes too large, and the electric energy loss of the battery during use becomes too large, resulting in too much heat generation. Therefore, when the width of the positive electrode post 2 and the width of the negative electrode post 3 satisfy 0.79mm or more and 3.52mm or less, the battery can be reduced in weight while keeping the resistance of the post low.

The present application also provides two specific embodiments:

the first embodiment: the number of pole pieces of the lithium ion battery is 13, the diameter D1 of the body 1 is 200mm, the height H1 is 5mm, the body 1 is packaged by an aluminum shell, and the width of the pole column is 0.99mm, and the length of the pole column is 270 mm.

The second embodiment: the number of pole pieces of the lithium ion battery is 195, the diameter D2 of the body 1 is 600mm, the height H2 is 60mm, the body 1 is packaged by an aluminum-plastic film, and the width and the length of the pole piece are 3.34mm and 900mm respectively.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium ion battery, characterized in that the lithium ion battery is in a shape of a circular cake, the lithium ion battery comprising:

the electrode plate comprises a body (1), wherein the body (1) is formed by overlapping pole pieces;

the positive pole column (2), the positive pole column (2) is arranged on the side surface of the body (1) along the circumferential direction of the body (1);

the cathode pole (3), the cathode pole (3) is arranged on the side surface of the body (1) along the circumferential direction of the body (1);

the positive electrode pole column (2) and the negative electrode pole column (3) are symmetrically arranged relative to the body (1).

2. The lithium ion battery according to claim 1, characterized in that the positive electrode post (2) and/or the negative electrode post (3) are located in the middle of the side of the body (1).

3. The lithium ion battery according to claim 1, wherein the positive electrode post (2) and/or the negative electrode post (3) is in the shape of a wire.

4. The lithium ion battery according to claim 3, wherein the length of the positive electrode post (2) and the length of the negative electrode post (3) both satisfy a range of 110mm or more and 920mm or less.

5. The lithium ion battery according to claim 3, wherein the width of the positive electrode post (2) satisfies 0.79mm or more and 3.52mm or less.

6. The lithium ion battery according to claim 3, wherein the width of the negative electrode post (3) is equal to or greater than 0.79mm and equal to or less than 3.52 mm.

7. The lithium ion battery according to any of claims 1 to 6, characterized in that the diameter D of the body (1) satisfies: d is more than or equal to 100mm and less than or equal to 600 mm.

8. The lithium-ion battery according to any one of claims 1 to 6, characterized in that the height H of the body (1) satisfies: h is more than or equal to 5mm and less than or equal to 60 mm.

9. The lithium ion battery of any one of claims 1 to 6, wherein the number of the pole pieces is 10 or more and 200 or less.

10. The lithium ion battery according to any of claims 1 to 6, characterized in that the body (1) is encapsulated by a steel casing, an aluminum casing or an aluminum plastic film.